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Investments (Details Narrative) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]      
Security owned and pledged as collateral, fair value, total $ 248,600   $ 232,500
Equity method investment, ownership percentage 10.00%    
Proceeds from sales of remaining common stock $ 7